Dataset: SEEPC MOCNESS-CTD

Name: MOCNESS-CTD data from R/V Atlantis AT21-02 and AT26-15 in the Barbados seeps and Gulf of Mexico, from 2012 and 2014 (SEEPC project)
Published: 2016-09-30
Keywords: oceans

Cite This Dataset

Spatial Extent: N:28.3972 E:-57.4708 S:11.5873 W:-94.6665

Project:

Connectivity in western Atlantic seep populations: Oceanographic and life-history processes underlying genetic structure (SEEPC)

Principal Investigator:

Craig M. Young (University of Oregon, OIMB)

Co-Principal Investigator:

Svetlana A. Maslakova (University of Oregon, OIMB)

BCO-DMO Data Manager:

Nancy Copley (Woods Hole Oceanographic Institution, WHOI BCO-DMO)

Version Date:

2016-09-30

Restricted:

Validated:

Current State:

Preliminary and in progress

MOCNESS-CTD data from R/V Atlantis AT21-02 and AT26-15 in the Barbados seeps and Gulf of Mexico, from 2012 and 2014 (SEEPC project)

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Description

Environmental and equipment data collected by the MOCNESS during deployments near methane seep sites on the Barbados Acretionary Prism, 2012 and in the northern Gulf of Mexico, 2014, from .PRO files.

Methods & Sampling

One-meter MOCNESSS nets fitted with 300 um mesh nets were towed obliquely over methane seep sites, closing and opening nets at intervals that varied with the depth. Not all environmental sensors were on, so some recorded constant zero values.

Data Processing Description

BCO-DMO Processing:
MOCNESS sensor data are served using a custom perl script. In order to apply the script, the file name and header must be in a prescribed format. BCO-DMO edited the filenames and headers to conform to these requirments. Minor editing was done to clarify dates and sample numbers. Bad records due to the instrument being out of the water at the start and end of the tow were removed.

Data Files

File
ctd_mocness.csv (Comma Separated Values (.csv), 13.75 MB) MD5:4d41e86c30e298d0eb844f43351fbea3 Primary data file for dataset ID 658408

More Information about this dataset

Funding Sources

Funding Source	Award Number
NSF Division of Ocean Sciences	OCE-1029841

Deployments

Deployment	Synonyms	Start Date	Platform	Investigator
AT21-02	SEEPC-Barbados	2012-06-01	R/V Atlantis	Cindy Van Dover (Chief Scientist)	data info
AT26-15	SEEPC GoMex	2014-05-21	R/V Atlantis	Cindy Van Dover (Chief Scientist)	data info

Instruments

CTD MOCNESS

Supplied Name:

Supplied Description:

Instrument Type

Generic Name: CTD MOCNESS

Community Identifier: http://vocab.nerc.ac.uk/collection/L05/current/131/

Generic Description:

The CTD part of the MOCNESS includes 1) a pressure (depth) sensor which is a thermally isolated titanium strain gauge with a standard range of 0-5000 decibars full scale, 2) A Sea Bird temperature sensor whose frequency output is measured and sent to the surface for logging and conversion to temperature by the software in the MOCNESS computer (The system allows better than 1 milli-degree resolution at 10 Hz sampling rate), and 3) A Sea Bird conductivity sensor whose output frequency is measured and sent to the surface for logging and conversion to conductivity by the software in the computer (The system allows better than 1 micro mho/cm at 10 Hz sampling rate). The data rate depends on the speed of the computer and the quality of the cable. With a good cable, the system can operate at 2400 baud, sampling all variables at 2 times per second. One sample every 4 seconds is the default, although the hardware can operate much faster. (From The MOCNESS Manual)

Parameters

Date and time formats are described in python strftime() syntax.

Supplied Name	Supplied description	Supplied Units	Standard Name
cruiseid	Cruise identification	unitless	cruiseid
year_local	Four digit year, local time		year
tow	Tow number		tow
day_local	Day of month, local time, 1 - 31		day_local
month_local	Month of year, local time 1 - 12		month_local
station	station number, from event log		station
yrday_local	year day, Julian Calendar local time	decimal day	yrday_local
time_local	time of day; local time using 24 hour clock.	HHmm.m	time_local
press	depth of sample	decibars	press
temp	temperature	degrees C.	temp
theta	potential temperature	degrees Celsius	potemp
sal	salinity calculated from conductivity; if salinity exceeds 50 or is less than 0 o/oo, salinity is set to nd.		sal
sigma	potential density at the surface	kg/m^3 -1000	sigma_0
fluor	fluorescence	milligrams/meter^3 ?	fluor
angle	angle of net frame relative to vertical (0-89 dgrees)	degrees	angle
flow	consecutive flow counts		flow
hzvel	horizontal net velocity m/min	meters/minute	hzvel
vtvel	vertical net velocity m/min	meters/minute	vtvel
vol	volume filtered	meters<sup>3</sup>	vol_filt
ptran	light transmission as percent	percent	trans_v
net	sequential MOCNESS net number		net
lat	latitude, North is positive	decimal degrees	lat
lon	longitude, East is positive	decimal degrees	lon

Status message

Database

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Dataset: SEEPC MOCNESS-CTD